You will need

- the coil material and its geometrical parameters

Instruction

1

**The inductance**proportional to the linear dimensions

*of the coil is**of the coil*, magnetic permeability of the core and the square of the number of turns of winding.

**The inductance of a**wound on a toroidal core is: L = ?0*?r*s*(N^2)/l. In this formula ?0 — magnetic constant, which is approximately equal to 1.26*(10^-6) Ng/m ?r — relative magnetic permeability of core material, which depends on the frequency), s is the cross — sectional area of the core, l is the length of the middle line of the core, N is the number of turns of the

*coil**coil*.

Relative magnetic permeability and material, as well as the number of turns N are dimensionless quantities.

2

Thus,

**the inductance***of the coil*is greater, the larger the area of its cross section. This condition increases the magnetic flux through the coil when the same current.**The inductance**inductance in µh can be calculated also by the formula: L = L0*(N^2)*D*(10^-3). Here N is the number of turns, D is the diameter of*of the coil**coil*in inches. The coefficient of L0 depends on the ratio of the length*of the coil*to its diameter. For single-layer*coil*it is equal to: L0 = 1/(0,1*((l/D)+0,45)).3

If circuit

If

*coil*are connected in series, their total**inductance**equals the sum of the inductances of all coils: L = (L1+L2+...+Ln)If

*coils*are connected in parallel, the total**inductance**equal to: L = 1/((1/L1)+(1/L2)+...+(1/Ln))Note

The main parameter characterizing the properties of inductors and chokes is the inductance. The inductance of the coil depends on its size and shape, number of turns and the magnetic permeability of the medium. . Characterizes the energy losses in the coil and is determined by the ratio of its inductive reactance to active resistance

Useful advice

The physical nature of inductance. Inductors have the property to render the reactance to alternating current with little resistance to direct current. Together with the capacitors they are used to create filters performing the frequency selection of electrical signals and for generating delay elements of signals and storage elements...